Very basic change to add a TriggerManager class owned by SafeBrowsingService.

components/safe_browsing/triggers/trigger_manager.cc

Index: components/safe_browsing/triggers/trigger_manager.cc
diff --git a/components/safe_browsing/triggers/trigger_manager.cc b/components/safe_browsing/triggers/trigger_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5734fecd57eb9c7f3ba3d5d1ce80fea2f9f4ad6b
--- /dev/null
+++ b/components/safe_browsing/triggers/trigger_manager.cc
@@ -0,0 +1,13 @@
+// Copyright (c) 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/safe_browsing/triggers/trigger_manager.h"
+
+namespace safe_browsing {
+
+TriggerManager::TriggerManager() {}
+
+TriggerManager::~TriggerManager() {}
+
+}  // namespace safe_browsing